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Contract assets (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Contract Assets
Interest inflation adjustments and exchange variations contract asset	R$ 564,302	R$ 638,208	R$ 622,803
Construction margin	139,976	125,603	R$ 109,369
Costs of expropriations recorded in contract asset	R$ 64,047	R$ 58,682

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- Definition

The profit (loss) recognised on exchanging construction services for an intangible asset in service concession arrangements. [Refer: Service concession arrangements [domain]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name SIC
-Number 29
-IssueDate 2024-01-01
-Paragraph 6A
-URI https://taxonomy.ifrs.org/xifrs-link?type=SIC&num=29&code=ifrs-tx-2024-en-r&anchor=para_6A&doctype=Standard
-URIDate 2024-03-27

+ Details

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- References

No definition available.

+ Details

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Namespace Prefix:	sbs_
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- References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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